47. Conductometric titration of 25 ml of pepsin solution with 0.1M potassium hydroxide solution yielded the following results:
Volume of 0.1 M KOH solution, ml 3.2 6.0 9.2 15.6 20.0 23.5
X•10-2, Sm•m-1 3.2 2.56 1.86 1.64 2.38 2.96
Determine the concentration of pepsin in mol/dm3.

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